Riding lawn mower



FIG. 1 is a right front perspective view of a riding lawn mower showing our new design;

FIG. 2 is a left side perspective view thereof;

FIG. 3 is a right rear perspective view thereof;

FIG. 4 is a left side perspective view thereof;

FIG. 5 is a top perspective view thereof;

FIG. 6 is a rear perspective view thereof;

FIG. 7 is a front perspective view thereof; and,

FIG. 8 is a right side elevational view thereof. 

The ornamental design for a riding lawn mower, as shown and described. 